English
Seamless alloy steel pipes are tubular structures made from alloy steel, manufactured without any welding seams. They are produced through processes like hot extrusion or cold drawing, ensuring a uniform composition and enhanced mechanical properties. These pipes are characterized by their high strength, toughness, and resistance to wear, corrosion, and high temperatures, owing to the addition of alloying elements such as chromium, molybdenum, and nickel.
Seamless alloy steel pipes are widely used in industries requiring high performance under extreme conditions. They are essential in oil and gas exploration, power generation, and chemical processing for transporting fluids and gases. Additionally, they are used in high-temperature applications like boilers, heat exchangers, and superheaters, as well as in structural components for heavy machinery and automotive systems, where durability and reliability are critical.
| Type | Description | Applications |
| Chromium-Molybdenum (Cr-Mo) Alloy Pipes | High-temperature strength, corrosion resistance. | Power plants, boilers, high-temperature pipelines. |
| Nickel Alloy Pipes | Exceptional corrosion and heat resistance. | Chemical processing, aerospace, marine environments. |
| Stainless Steel Alloy Pipes | Corrosion resistance, durability. | Food processing, pharmaceuticals, architectural structures. |
| Low-Temperature Alloy Pipes | Designed for cryogenic environments. | LNG plants, refrigeration systems, cryogenic storage. |
| High-Temperature Alloy Pipes | Extreme heat and pressure resistance. | Power generation, petrochemical plants, refineries. |
| Corrosion-Resistant Alloy Pipes | Withstands corrosive environments. | Chemical processing, offshore oil rigs, desalination plants. |
| High-Strength Alloy Pipes | High strength-to-weight ratio. | Heavy machinery, automotive, aerospace. |
| Hydraulic and Pneumatic Alloy Pipes | Fluid and gas transport in hydraulic systems. | Industrial machinery, construction equipment, automation systems. |
| Thick-Wall Alloy Pipes | Designed for high-pressure applications. | Oil and gas, power plants. |
| Thin-Wall Alloy Pipes | Lightweight, precision applications. | Automotive and aerospace. |
| Oil and Alloy Pipes | Exploration, extraction, and transportation of oil and gas. | Oil and gas pipelines, drilling equipment, refineries. |
| Structural Alloy Pipes | Construction and engineering projects. | Building frameworks, bridges, support structures. |
| Precision Alloy Pipes | High-precision applications. | Aerospace, automotive, medical equipment. |
| Standard | Common Grades | Applications |
| ASTM A335 | P5, P9, P11, P22, P91 | High-temperature pipelines, power plants, refineries. |
| ASTM A213 | T5, T9, T11, T22, T91, TP304, TP316, TP321 | Boilers, heat exchangers, superheaters. |
| ASTM A106 | A, B, C | General-purpose high-temperature pipelines. |
| ASTM A333 | Grade 6 | Cryogenic and refrigeration systems. |
| API 5L | A, B, X42, X52, X60, X65, X70, X80 | Oil and gas pipelines. |
| DIN 17175 | St35.8, St45.8, 15Mo3, 13CrMo44 | Power plants, high-temperature applications. |
| EN 10216 | P195, P235, P265, 13CrMo4-5, 10CrMo9-10 | Industrial and structural uses. |
| JIS G3458 | STPG38, STPG42 | General-purpose pipelines. |
| JIS G3463 | STPA12, STPA20, STPA22, STPA23 | Boilers, heat exchangers. |
| Standard | Grade | Chemical Composition (Key Elements) | Mechanical Properties |
| ASTM A335 | P5 | Cr: 4-6%, Mo: 0.45-0.65%, C: ≤0.15% | Tensile Strength: 415 MPa, Yield Strength: 205 MPa, Elongation: 30% |
| P9 | Cr: 8-10%, Mo: 0.9-1.1%, C: ≤0.15% | Tensile Strength: 415 MPa, Yield Strength: 205 MPa, Elongation: 30% | |
| P11 | Cr: 1-1.5%, Mo: 0.45-0.65%, C: ≤0.15% | Tensile Strength: 415 MPa, Yield Strength: 205 MPa, Elongation: 30% | |
| P22 | Cr: 2-2.5%, Mo: 0.9-1.1%, C: ≤0.15% | Tensile Strength: 415 MPa, Yield Strength: 205 MPa, Elongation: 30% | |
| P91 | Cr: 8-9.5%, Mo: 0.85-1.05%, V: 0.18-0.25%, Nb: 0.06-0.1%, C: ≤0.15% | Tensile Strength: 585 MPa, Yield Strength: 415 MPa, Elongation: 20% | |
| ASTM A213 | T5 | Cr: 4-6%, Mo: 0.45-0.65%, C: ≤0.15% | Tensile Strength: 415 MPa, Yield Strength: 205 MPa, Elongation: 30% |
| T9 | Cr: 8-10%, Mo: 0.9-1.1%, C: ≤0.15% | Tensile Strength: 415 MPa, Yield Strength: 205 MPa, Elongation: 30% | |
| T11 | Cr: 1-1.5%, Mo: 0.45-0.65%, C: ≤0.15% | Tensile Strength: 415 MPa, Yield Strength: 205 MPa, Elongation: 30% | |
| T22 | Cr: 2-2.5%, Mo: 0.9-1.1%, C: ≤0.15% | Tensile Strength: 415 MPa, Yield Strength: 205 MPa, Elongation: 30% | |
| T91 | Cr: 8-9.5%, Mo: 0.85-1.05%, V: 0.18-0.25%, Nb: 0.06-0.1%, C: ≤0.15% | Tensile Strength: 585 MPa, Yield Strength: 415 MPa, Elongation: 20% | |
| ASTM A106 | A | C: ≤0.25%, Mn: 0.27-0.93%, Si: ≥0.1% | Tensile Strength: 330 MPa, Yield Strength: 205 MPa, Elongation: 30% |
| B | C: ≤0.3%, Mn: 0.29-1.06%, Si: ≥0.1% | Tensile Strength: 415 MPa, Yield Strength: 240 MPa, Elongation: 30% | |
| C | C: ≤0.35%, Mn: 0.29-1.06%, Si: ≥0.1% | Tensile Strength: 485 MPa, Yield Strength: 275 MPa, Elongation: 30% | |
| ASTM A333 | Grade 6 | C: ≤0.3%, Mn: 0.29-1.06%, Si: ≥0.1%, Ni: 3.18-3.82% | Tensile Strength: 415 MPa, Yield Strength: 240 MPa, Elongation: 30% |
| API 5L | X42 | C: ≤0.28%, Mn: ≤1.3%, Si: ≤0.45% | Tensile Strength: 415 MPa, Yield Strength: 290 MPa, Elongation: 30% |
| X52 | C: ≤0.28%, Mn: ≤1.4%, Si: ≤0.45% | Tensile Strength: 455 MPa, Yield Strength: 360 MPa, Elongation: 30% | |
| X65 | C: ≤0.26%, Mn: ≤1.45%, Si: ≤0.45% | Tensile Strength: 535 MPa, Yield Strength: 450 MPa, Elongation: 30% | |
| DIN 17175 | 13CrMo4-5 | Cr: 0.7-1.15%, Mo: 0.4-0.6%, C: ≤0.15% | Tensile Strength: 440-590 MPa, Yield Strength: 290 MPa, Elongation: 20% |
| EN 10216 | P235 | C: ≤0.16%, Mn: ≤1.4%, Si: ≤0.35% | Tensile Strength: 360-510 MPa, Yield Strength: 235 MPa, Elongation: 25% |
| JIS G3458 | STPG38 | C: ≤0.25%, Mn: ≤0.9%, Si: ≤0.35% | Tensile Strength: 380 MPa, Yield Strength: 205 MPa, Elongation: 30% |
| JIS G3463 | STPA12 | Cr: 0.8-1.25%, Mo: 0.45-0.65%, C: ≤0.15% | Tensile Strength: 410 MPa, Yield Strength: 205 MPa, Elongation: 30% |
1. Product Name: Alloy Steel Pipes, Alloy Steel Tubes, Alloy Steel Seamless Pipes, Alloy Steel Seamless Tubes
2. Dimensions and Sizes
Outer Diameter (OD): Ranges from 1/8 inch (3.175 mm) to 36 inches (914 mm) or more, depending on the application.
Wall Thickness: Varies from thin-wall (e.g., 0.5 mm) to thick-wall (e.g., 50 mm or more).
Length: Typically supplied in random lengths (6-12 meters) or fixed lengths as per customer requirements.
Tolerance: Strict dimensional tolerances are maintained for OD, wall thickness, and straightness to ensure precision.
3. Surface Finish
Smooth Finish: For general-purpose applications.
Polished Finish: For decorative or sanitary applications.
Pickled and Passivated: For enhanced corrosion resistance in stainless steel pipes.
Galvanized: For additional protection against corrosion in carbon steel pipes.
1. Raw Material: Selection of high-quality alloy steel billets or round bars.
2. Heating: Billets are heated to 1100°C-1300°C for malleability.
3. Piercing: A rotating piercer creates a hollow shell from the billet.
4. Elongation (Rolling) : The shell is rolled to reduce wall thickness and diameter.
5. Sizing: Final dimensions are achieved using a sizing mill.
6. Heat Treatment: Annealing, normalizing, or quenching and tempering to enhance properties.
7. Straightening: Pipes are straightened to meet straightness tolerances.
8. Cutting: Pipes are cut to length and ends are chamfered or beveled.
9. Surface Treatment: Pickling, passivation, galvanizing, or polishing for improved surface quality.
10. Inspection: Hydrostatic, ultrasonic, eddy current, mechanical, and chemical tests.
11. Marking & Packaging: Pipes are marked with relevant information and packaged for shipment.
Seamless alloy pipes are crucial in oil and gas for pipelines, drilling equipment, and offshore platforms. They handle high pressures and resist corrosion.
Used in power plants for boilers, turbines, and nuclear reactors. These pipes withstand high temperatures and pressures while ensuring reliability.
Ideal for chemical plants, where pipes transport corrosive chemicals and gases. They offer high strength and corrosion resistance.
Applied in exhaust systems and structural components of vehicles. They provide heat resistance and durability.
Used in structural frameworks of bridges, tunnels, and buildings. Also used for decorative elements like handrails.
Essential in shipbuilding and offshore structures. They resist seawater corrosion and provide high strength.
Used in pipework and processing equipment. They ensure hygiene and prevent contamination.
Used in manufacturing equipment and laboratory setups. They maintain purity and resist corrosion.
Used in aircraft components and spacecraft. They provide high strength and reliability in demanding conditions.
